Reining in Libya's militias

A year ago they rose up to take on Muammar Gaddafi's brutal regime. Today, Libya's revolutionary militias patrol the streets, man checkpoints and control access to Tripoli's airport. But Amnesty International has warned of human rights abuses, and says that these groups now pose a threat to the country's stability. Meanwhile, the government appears incapable of bringing the various factions in line.